US5583644A - System for correcting image density of an image forming system based on a detection result of a test image - Google Patents

System for correcting image density of an image forming system based on a detection result of a test image Download PDF

Info

Publication number
US5583644A
US5583644A US08/172,106 US17210693A US5583644A US 5583644 A US5583644 A US 5583644A US 17210693 A US17210693 A US 17210693A US 5583644 A US5583644 A US 5583644A
Authority
US
United States
Prior art keywords
image
density
levels
predetermined test
data table
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/172,106
Other languages
English (en)
Inventor
Nobuatsu Sasanuma
Hisashi Fukushima
Tetsuya Atsumi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ATSUMI, TETSUYA, FUKUSHIMA, HISASHI, SASANUMA, NOBUATSU
Application granted granted Critical
Publication of US5583644A publication Critical patent/US5583644A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5062—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the characteristics of an image on the copy material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture
    • H04N1/4078—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture using gradational references, e.g. grey-scale test pattern analysis
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00033—Image density detection on recording member
    • G03G2215/00037—Toner image detection
    • G03G2215/00042—Optical detection
US08/172,106 1992-12-28 1993-12-23 System for correcting image density of an image forming system based on a detection result of a test image Expired - Lifetime US5583644A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP34964392A JP3274200B2 (ja) 1992-12-28 1992-12-28 画像形成方法及び装置
JP4-349643 1992-12-28

Publications (1)

Publication Number Publication Date
US5583644A true US5583644A (en) 1996-12-10

Family

ID=18405127

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/172,106 Expired - Lifetime US5583644A (en) 1992-12-28 1993-12-23 System for correcting image density of an image forming system based on a detection result of a test image

Country Status (4)

Country Link
US (1) US5583644A (ja)
EP (1) EP0604941B1 (ja)
JP (1) JP3274200B2 (ja)
DE (1) DE69329417T2 (ja)

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5694223A (en) * 1995-03-07 1997-12-02 Minolta Co., Ltd. Digital image forming apparatus which specifies a sensitivity characteristic of a photoconductor
US5793406A (en) * 1996-03-06 1998-08-11 Hewlett-Packard Company Adjustment of dot size for laser imagers
US5822079A (en) * 1995-03-07 1998-10-13 Minolta Co., Ltd. Digital image forming apparatus with test image optimization
US5835235A (en) * 1994-09-26 1998-11-10 Minolta Co., Ltd. Image forming apparatus which establishes image formation values using environmentally sensitive references
US5873011A (en) * 1996-03-13 1999-02-16 Minolta Co., Ltd. Image forming apparatus
US5991558A (en) * 1997-03-27 1999-11-23 Fuji Xerox Co., Ltd. Image forming apparatus that control the reflected light detected by an optical scanner in response to a gradation area percentage of a toner patch
US6021288A (en) * 1997-09-22 2000-02-01 Minolta Co., Ltd. Image forming apparatus
US6034788A (en) * 1994-03-25 2000-03-07 Canon Kabushiki Kaisha Image forming apparatus and method
US6094502A (en) * 1996-03-13 2000-07-25 Minolta Co., Ltd. Image formation apparatus that allows correction of γ correction data and adjustment method thereof
US6115561A (en) * 1996-07-22 2000-09-05 Canon Kabushiki Kaisha Image forming apparatus and a controlling method of an image forming apparatus
US6148158A (en) * 1995-07-20 2000-11-14 Canon Kabushiki Kaisha Image processing apparatus and method having a plurality of image forming units for performing image formation using predetermined colors
US6172771B1 (en) * 1997-04-22 2001-01-09 Canon Kabushiki Kaisha Image forming system and calibration method for image forming conditions
US6243542B1 (en) 1998-12-14 2001-06-05 Canon Kabushiki Kaisha System for controlling the density of toner images in an image forming apparatus
US6271937B1 (en) * 1995-08-07 2001-08-07 Peter A. Zuber Color correction of dot linearities in multiple print engine system
WO2002010860A1 (en) * 2000-08-01 2002-02-07 Heidelberg Digital L.L.C. Image-forming device having on-line image quality assessment and related method
US20020054354A1 (en) * 2000-09-20 2002-05-09 Suzuko Fukao Image processing apparatus and image processing method
US20020054302A1 (en) * 2000-08-09 2002-05-09 Ricoh Company, Ltd. Printer controller, image forming apparatus and storage medium
US6418281B1 (en) * 1999-02-24 2002-07-09 Canon Kabushiki Kaisha Image processing apparatus having calibration for image exposure output
US6519054B1 (en) 1998-04-09 2003-02-11 Canon Kabushiki Kaisha Image processing apparatus and method
US6560418B2 (en) 2001-03-09 2003-05-06 Lexmark International, Inc. Method of setting laser power and developer bias in a multi-color electrophotographic machinie
US20030117674A1 (en) * 2001-12-26 2003-06-26 Toshiba Tec Kabushiki Kaisha Image forming apparatus and method of controlling the apparatus
US6606330B2 (en) 2001-05-07 2003-08-12 Lexmark International, Inc. Laser drive compensation by duty cycle and power
US6611666B2 (en) 2001-06-15 2003-08-26 Nexpress Solutions Llc Densitometer with improved accuracy for use in color image processing apparatus
US6636326B1 (en) 1995-08-07 2003-10-21 T/R Systems Method for calibrating a color marking engine for halftone operation
US20050007621A1 (en) * 1995-08-07 2005-01-13 Barry Michael W. Method and apparatus for determining toner level in electrophotographic print engines
US6897978B1 (en) 1998-07-30 2005-05-24 Canon Kabushiki Kaisha Image processing apparatus image processing method and recording medium
US6909814B1 (en) 1999-09-17 2005-06-21 Canon Kabushiki Kaisha Image processing method of generating conversion data for a scanner and calibration method employing the scanner
US20050214015A1 (en) * 2004-03-25 2005-09-29 Eastman Kodak Company Densitometer for use in a printer
US7006246B1 (en) 1999-09-17 2006-02-28 Canon Kabushiki Kaisha Image processing method, apparatus, recording medium and chart therefor
US20060115284A1 (en) * 2004-11-30 2006-06-01 Xerox Corporation. Semi-automatic image quality adjustment for multiple marking engine systems
US20060193017A1 (en) * 1995-08-07 2006-08-31 Zuber Peter A Methods and apparatus for real time calibration of a marking engine in a print system
US20060204257A1 (en) * 2005-03-09 2006-09-14 Sharp Kabushiki Kaisha Image forming apparatus
US20090296174A1 (en) * 2008-05-28 2009-12-03 Konica Minolta Business Technologies, Inc Image forming apparatus and density correcting method
US20110217052A1 (en) * 2010-03-05 2011-09-08 Canon Kabushiki Kaisha Color image forming apparatus having function of obtaining color information of patch
US20150098095A1 (en) * 2013-10-07 2015-04-09 Canon Kabushiki Kaisha Image forming apparatus that performs calibration for maintaining image quality
JP2015118286A (ja) * 2013-12-18 2015-06-25 キヤノン株式会社 画像形成装置
US9372460B2 (en) 2013-12-03 2016-06-21 Canon Kabushiki Kaisha Image forming apparatus holding tone correction table
US9459579B2 (en) 2014-09-17 2016-10-04 Canon Kabushiki Kaisha Image forming apparatus that corrects image forming condition based on measurement result of measurement image
US9501017B2 (en) 2014-09-18 2016-11-22 Canon Kabushiki Kaisha Image forming apparatus that suppresses fluctuations in density of successively formed images even if charge amount of developer changes
US10031460B2 (en) 2016-02-29 2018-07-24 Canon Kabushiki Kaisha Image forming apparatus and method of controlling an image forming apparatus

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5856876A (en) * 1995-04-06 1999-01-05 Canon Kabushiki Kaisha Image processing apparatus and method with gradation characteristic adjustment
EP0740221B1 (en) * 1995-04-26 2001-10-10 Canon Kabushiki Kaisha Image forming apparatus and intermediate transfer member
US5824408A (en) * 1995-04-28 1998-10-20 Canon Kabushiki Kaisha White electroconductive coating composition and transfer material-carrying member
DE69730920T2 (de) * 1996-07-26 2005-08-25 Canon K.K. Bilderzeugungsgerät und dazu montierbare Prozesskassette
AU8258498A (en) * 1997-07-16 1999-02-10 Topaz Technologies, Inc. Carriage mounted densitometer
JP3703061B2 (ja) * 1997-12-08 2005-10-05 富士写真フイルム株式会社 濃度ムラ補正方法及び該方法を用いた画像記録装置
US7085018B1 (en) 1999-10-19 2006-08-01 Hell Gravure Systems Gmbh Method for engraving printing cylinders
JP5241621B2 (ja) * 2009-06-10 2013-07-17 キヤノン株式会社 画像形成装置、及び画像形成装置の制御方法
JP6263095B2 (ja) * 2014-06-30 2018-01-17 シャープ株式会社 画像形成装置
JP6440424B2 (ja) * 2014-09-18 2018-12-19 キヤノン株式会社 画像形成装置

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4680646A (en) * 1983-09-05 1987-07-14 Canon Kabushiki Kaisha Image forming device for reproducing a half-tone image
EP0266186A2 (en) * 1986-10-29 1988-05-04 Canon Kabushiki Kaisha Colour image reading apparatus or colour image forming apparatus
US4888636A (en) * 1983-03-08 1989-12-19 Canon Kabushiki Kaisha Image reproducing system
US4949135A (en) * 1989-08-17 1990-08-14 Eastman Kodak Company Visual based process control apparatus which is based on a near uniform human visual response space
US5060013A (en) * 1990-07-31 1991-10-22 Eastman Kodak Company Hardcopy output device with test patch location sequencer
US5148289A (en) * 1989-07-17 1992-09-15 Minolta Camera Kabushiki Kaisha Image forming apparatus
JPH04268873A (ja) * 1991-02-22 1992-09-24 Canon Inc 画像処理装置
US5241347A (en) * 1990-11-29 1993-08-31 Minolta Camera Kabushiki Kaisha Image forming apparatus comprising means for automatically adjusting image density
US5345315A (en) * 1988-11-23 1994-09-06 Imatec, Ltd. Method and system for improved tone and color reproduction of electronic image on hard copy using a closed loop control
US5463473A (en) * 1989-10-31 1995-10-31 Canon Kabushiki Kaisha Siphen for correcting a pulse-width modulated signal in a recording apparatus

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4888636A (en) * 1983-03-08 1989-12-19 Canon Kabushiki Kaisha Image reproducing system
US4680646A (en) * 1983-09-05 1987-07-14 Canon Kabushiki Kaisha Image forming device for reproducing a half-tone image
EP0266186A2 (en) * 1986-10-29 1988-05-04 Canon Kabushiki Kaisha Colour image reading apparatus or colour image forming apparatus
US5345315A (en) * 1988-11-23 1994-09-06 Imatec, Ltd. Method and system for improved tone and color reproduction of electronic image on hard copy using a closed loop control
US5148289A (en) * 1989-07-17 1992-09-15 Minolta Camera Kabushiki Kaisha Image forming apparatus
US4949135A (en) * 1989-08-17 1990-08-14 Eastman Kodak Company Visual based process control apparatus which is based on a near uniform human visual response space
US5463473A (en) * 1989-10-31 1995-10-31 Canon Kabushiki Kaisha Siphen for correcting a pulse-width modulated signal in a recording apparatus
US5060013A (en) * 1990-07-31 1991-10-22 Eastman Kodak Company Hardcopy output device with test patch location sequencer
US5241347A (en) * 1990-11-29 1993-08-31 Minolta Camera Kabushiki Kaisha Image forming apparatus comprising means for automatically adjusting image density
JPH04268873A (ja) * 1991-02-22 1992-09-24 Canon Inc 画像処理装置
US5258783A (en) * 1991-02-22 1993-11-02 Canon Kabushiki Kaisha Image processing method and apparatus with gamma-correction control

Cited By (62)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6034788A (en) * 1994-03-25 2000-03-07 Canon Kabushiki Kaisha Image forming apparatus and method
US5835235A (en) * 1994-09-26 1998-11-10 Minolta Co., Ltd. Image forming apparatus which establishes image formation values using environmentally sensitive references
US5694223A (en) * 1995-03-07 1997-12-02 Minolta Co., Ltd. Digital image forming apparatus which specifies a sensitivity characteristic of a photoconductor
US5822079A (en) * 1995-03-07 1998-10-13 Minolta Co., Ltd. Digital image forming apparatus with test image optimization
US6148158A (en) * 1995-07-20 2000-11-14 Canon Kabushiki Kaisha Image processing apparatus and method having a plurality of image forming units for performing image formation using predetermined colors
US20060193017A1 (en) * 1995-08-07 2006-08-31 Zuber Peter A Methods and apparatus for real time calibration of a marking engine in a print system
US6636326B1 (en) 1995-08-07 2003-10-21 T/R Systems Method for calibrating a color marking engine for halftone operation
US7301665B2 (en) 1995-08-07 2007-11-27 Electronics For Imaging, Inc. Method and apparatus for determining toner level in electrophotographic print engines
US7554687B2 (en) 1995-08-07 2009-06-30 Electronics For Imaging, Inc. Methods and apparatus for determining toner level in electro-photographic print engines
US20050007621A1 (en) * 1995-08-07 2005-01-13 Barry Michael W. Method and apparatus for determining toner level in electrophotographic print engines
US7116444B2 (en) 1995-08-07 2006-10-03 Electronics For Imaging, Inc. Method and apparatus for determining toner level in electrophotographic print engines
US20040125391A1 (en) * 1995-08-07 2004-07-01 Zuber Peter A. Method for calibrating a color marking engine for halftone operation
US7301671B2 (en) 1995-08-07 2007-11-27 Electronics For Imaging, Inc. Method for calibrating a color marking engine for halftone operation
US6271937B1 (en) * 1995-08-07 2001-08-07 Peter A. Zuber Color correction of dot linearities in multiple print engine system
US7349124B2 (en) 1995-08-07 2008-03-25 Electronics For Imaging, Inc. Methods and apparatus for real time calibration of a marking engine in a print system
US7791777B2 (en) 1995-08-07 2010-09-07 Electronics For Imaging, Inc. Method and apparatus for providing a color-balanced multiple print engine
US7532347B2 (en) 1995-08-07 2009-05-12 Electronics For Imaging, Inc. Methods and apparatus for routing pages to printers in a multi-print engine as a function of print job parameters
US7489422B2 (en) 1995-08-07 2009-02-10 Electronics For Imaging, Inc. Methods and apparatus for real time calibration of a print system marking engine
US5793406A (en) * 1996-03-06 1998-08-11 Hewlett-Packard Company Adjustment of dot size for laser imagers
US6094502A (en) * 1996-03-13 2000-07-25 Minolta Co., Ltd. Image formation apparatus that allows correction of γ correction data and adjustment method thereof
US5873011A (en) * 1996-03-13 1999-02-16 Minolta Co., Ltd. Image forming apparatus
US6115561A (en) * 1996-07-22 2000-09-05 Canon Kabushiki Kaisha Image forming apparatus and a controlling method of an image forming apparatus
US5991558A (en) * 1997-03-27 1999-11-23 Fuji Xerox Co., Ltd. Image forming apparatus that control the reflected light detected by an optical scanner in response to a gradation area percentage of a toner patch
US6172771B1 (en) * 1997-04-22 2001-01-09 Canon Kabushiki Kaisha Image forming system and calibration method for image forming conditions
US6021288A (en) * 1997-09-22 2000-02-01 Minolta Co., Ltd. Image forming apparatus
US6519054B1 (en) 1998-04-09 2003-02-11 Canon Kabushiki Kaisha Image processing apparatus and method
US6897978B1 (en) 1998-07-30 2005-05-24 Canon Kabushiki Kaisha Image processing apparatus image processing method and recording medium
US6243542B1 (en) 1998-12-14 2001-06-05 Canon Kabushiki Kaisha System for controlling the density of toner images in an image forming apparatus
US6418281B1 (en) * 1999-02-24 2002-07-09 Canon Kabushiki Kaisha Image processing apparatus having calibration for image exposure output
US6909814B1 (en) 1999-09-17 2005-06-21 Canon Kabushiki Kaisha Image processing method of generating conversion data for a scanner and calibration method employing the scanner
US20050185856A1 (en) * 1999-09-17 2005-08-25 Canon Kabushiki Kaisha Image processing method of generating conversion data for a scanner and calibration method employing the scanner
US7006246B1 (en) 1999-09-17 2006-02-28 Canon Kabushiki Kaisha Image processing method, apparatus, recording medium and chart therefor
US7031550B2 (en) 1999-09-17 2006-04-18 Canon Kabushiki Kaisha Image processing method of generating conversion data for a scanner and calibration method employing the scanner
US6650848B1 (en) * 2000-08-01 2003-11-18 Heidelberger Druckmaschine Ag Image-forming device having on-line image quality assessment and related method
WO2002010860A1 (en) * 2000-08-01 2002-02-07 Heidelberg Digital L.L.C. Image-forming device having on-line image quality assessment and related method
US20020054302A1 (en) * 2000-08-09 2002-05-09 Ricoh Company, Ltd. Printer controller, image forming apparatus and storage medium
US7180625B2 (en) * 2000-08-09 2007-02-20 Ricoh Company, Ltd. Printer controller, image forming apparatus and storage medium
US7081972B2 (en) * 2000-09-20 2006-07-25 Canon Kabushiki Kaisha Image processing apparatus and image processing method
US20020054354A1 (en) * 2000-09-20 2002-05-09 Suzuko Fukao Image processing apparatus and image processing method
US6560418B2 (en) 2001-03-09 2003-05-06 Lexmark International, Inc. Method of setting laser power and developer bias in a multi-color electrophotographic machinie
US6606330B2 (en) 2001-05-07 2003-08-12 Lexmark International, Inc. Laser drive compensation by duty cycle and power
US6611666B2 (en) 2001-06-15 2003-08-26 Nexpress Solutions Llc Densitometer with improved accuracy for use in color image processing apparatus
US7050199B2 (en) * 2001-12-26 2006-05-23 Kabushiki Kaisha Toshiba Image forming apparatus and method of controlling the apparatus
US20030117674A1 (en) * 2001-12-26 2003-06-26 Toshiba Tec Kabushiki Kaisha Image forming apparatus and method of controlling the apparatus
US20050214015A1 (en) * 2004-03-25 2005-09-29 Eastman Kodak Company Densitometer for use in a printer
WO2005103836A1 (en) 2004-03-25 2005-11-03 Eastman Kodak Company Densitometer for use in a printer
US7162172B2 (en) 2004-11-30 2007-01-09 Xerox Corporation Semi-automatic image quality adjustment for multiple marking engine systems
US20060115284A1 (en) * 2004-11-30 2006-06-01 Xerox Corporation. Semi-automatic image quality adjustment for multiple marking engine systems
US20060204257A1 (en) * 2005-03-09 2006-09-14 Sharp Kabushiki Kaisha Image forming apparatus
US20090296174A1 (en) * 2008-05-28 2009-12-03 Konica Minolta Business Technologies, Inc Image forming apparatus and density correcting method
US8305664B2 (en) 2008-05-28 2012-11-06 Konica Minolta Business Technologies, Inc. Image forming apparatus and density correcting method
US20110217052A1 (en) * 2010-03-05 2011-09-08 Canon Kabushiki Kaisha Color image forming apparatus having function of obtaining color information of patch
US8594517B2 (en) * 2010-03-05 2013-11-26 Canon Kabushiki Kaisha Color image forming apparatus having function of obtaining color information of patch
US9075330B2 (en) 2010-03-05 2015-07-07 Canon Kabushiki Kaisha Color image forming apparatus having function of obtaining color information of patch
US20150098095A1 (en) * 2013-10-07 2015-04-09 Canon Kabushiki Kaisha Image forming apparatus that performs calibration for maintaining image quality
US9516196B2 (en) * 2013-10-07 2016-12-06 Canon Kabushiki Kaisha Image forming apparatus that performs calibration for maintaining image quality
US9372460B2 (en) 2013-12-03 2016-06-21 Canon Kabushiki Kaisha Image forming apparatus holding tone correction table
JP2015118286A (ja) * 2013-12-18 2015-06-25 キヤノン株式会社 画像形成装置
US9436145B2 (en) 2013-12-18 2016-09-06 Canon Kabushiki Kaisha Image forming apparatus including correction unit that corrects tone correction table
US9459579B2 (en) 2014-09-17 2016-10-04 Canon Kabushiki Kaisha Image forming apparatus that corrects image forming condition based on measurement result of measurement image
US9501017B2 (en) 2014-09-18 2016-11-22 Canon Kabushiki Kaisha Image forming apparatus that suppresses fluctuations in density of successively formed images even if charge amount of developer changes
US10031460B2 (en) 2016-02-29 2018-07-24 Canon Kabushiki Kaisha Image forming apparatus and method of controlling an image forming apparatus

Also Published As

Publication number Publication date
EP0604941A2 (en) 1994-07-06
DE69329417T2 (de) 2001-03-08
EP0604941A3 (en) 1995-04-05
EP0604941B1 (en) 2000-09-13
JP3274200B2 (ja) 2002-04-15
JPH06198973A (ja) 1994-07-19
DE69329417D1 (de) 2000-10-19

Similar Documents

Publication Publication Date Title
US5583644A (en) System for correcting image density of an image forming system based on a detection result of a test image
JP3678875B2 (ja) 画像形成装置
US5258783A (en) Image processing method and apparatus with gamma-correction control
US5859933A (en) Image forming apparatus
US6148158A (en) Image processing apparatus and method having a plurality of image forming units for performing image formation using predetermined colors
JP4371803B2 (ja) 画像形成装置
US6785480B2 (en) Image forming apparatus having a plurality of image forming speeds
JP3658461B2 (ja) 画像形成装置
JPH1169157A (ja) 画像形成装置
EP0515162B1 (en) Image processing method and apparatus
US5414531A (en) Image forming control based on a stored operation condition
JP2017151170A (ja) 画像形成装置、画像形成方法
JP5344597B2 (ja) 画像形成装置
US5453773A (en) Electrophotographic image forming apparatus comprising means for automatically adjusting image reproduction density
JP3728383B2 (ja) 画像出力システム
JPH08289149A (ja) 画像記録装置およびその方法
JP2005274771A (ja) 画像形成装置及び画像形成方法
JPH09107476A (ja) 画像形成装置
JPH05303254A (ja) 電子写真画像出力装置の画像濃度設定方法
JP3489258B2 (ja) 画像形成装置
JP3666643B2 (ja) 画像形成装置
JPH07131607A (ja) 画像形成装置
JPH07131651A (ja) 画像形成装置
JP3551988B2 (ja) 画像形成装置
JP3853909B2 (ja) 画像形成装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: CANON KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SASANUMA, NOBUATSU;FUKUSHIMA, HISASHI;ATSUMI, TETSUYA;REEL/FRAME:006840/0741

Effective date: 19931215

STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12